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| Number | Title | Issue Date |
| 8031861 | Communication system tonal component maintenance techniques An apparatus and method for suppressing noise is presented. The apparatus may utilize a filter bank of bandpass filters to split the input noisy speech-containing signal into separate frequency bands. To determine whether the input signal contains speech, DTMF tones... | 10/04/2011 |
| 7366294 | Communication system tonal component maintenance techniques An apparatus and method for suppressing noise is presented. The apparatus may utilize a filter bank of bandpass filters to split the input noisy speech-containing signal into separate frequency bands. To determine whether the input signal contains speech, DTMF tones... | 04/29/2008 |
| 6928158 | Transmission of a clock by a capacitive isolating barrier A method and a circuit for regenerating a clock signal based on a flip-flop and on two complementary signals at the clock rate, the flip-flop being assembled as a divider by two of a combination of shaping signals each translating a direction, respectively rising or... | 08/09/2005 |
| 6181790 | Electromagnetic relay used in a telephone exchange or the like and contact spring assembly for the electromagnetic relay A contact spring assembly for an electromagnetic relay has an armature, a plurality of movable contact springs, and a plurality of transfer contact spring sets and a plurality of make contact spring sets. The armature is centrally placed in the contact sp... | 01/30/2001 |
| 5966436 | Redialing method A redialing method in a communication apparatus provides that the digits of a telephone number are consecutively input by a user, and the actual time intervals between the consecutive inputs are measured and stored in memory along with the digits of the t... | 10/12/1999 |
| 5101429 | Electronic telephone set Electronic telephone set, comprising a transmission circuit arranged for being coupled to a telecommunication network and for receiving and transmitting speech signals, a keyboard means comprising a first matrix with respective numbers of intersecting fir... | 03/31/1992 |
| 4484336 | Digital transmission systems Feedback equalization is employed for digital repeaters of transmission systems having twisted-wire pairs, in order to reduce intersymbol interference while minimizing near-end crosstalk gain. Previously the incoming signal was selectively amplified at th... | 11/20/1984 |
| 4237345 | Transformer with integral reed contact A magnetically operated switch especially useful in telephone applications includes a transformer having a plurality of windings on an E-frame core and a reed switch magnetically coupled to the core by a plurality of high permeability strips which are pla... | 12/02/1980 |
| 4145579 | Key telephone unit protective coupler There is disclosed a protective coupler for use with key telephone line units (KTU) to provide isolation between the terminal equipment and the central office line. The protective coupler plugs onto the KTU option socket and establishes a dielectric barri... | 03/20/1979 |
| 3985970 | Regeneration of signalling pulses Regeneration of distorted signalling pulses is obtained by means of a Schmitt trigger which is fired when the input pulse has varied by a preset value ƊV the maximum voltage of said pulse being stored in a memory device so as to maintain the trigger in t... | 10/12/1976 |
| 3970800 | Switching arrangement for ascertaining overlap prior to transfer of code digits in a telephone exchange Apparatus for ascertaining an overlap prior to transfer of code digits being interpreted in a telephone exchange is described. A dial control device and a counting chain storing dialed code digits are provided for each subscriber and/or local repeater. A ... | 07/20/1976 |
| 3931474 | Tone injection circuit A precise tone injection circuit for injecting tone signals to a constant current junctor circuit in a two-wire balanced circuit. The tone injection circuit includes a pair of transistors operating as constant current sources feeding the respective ones o... | 01/06/1976 |
